No clue

[williedigit]

Found near a place where I have been finding some civil war items but this is the biggest I have ever seen no clue what gun or cannon this might have shot it out of there is a firing primer in the center help me figure this out, just in shock how big it is

 

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[SorenCoins]

Maybe old can or maybe even a cannon shell?

 

[1637]

thats cool,flare gun maybe
brad

 

[osage express]

Maybe a Coffman engine starter

 

[ecmjamsit]

Looks like 40 mm grenade shell. Used on military M-16 when I was active duty Air Force. Measure it and see ?

https://en.wikipedia.org/wiki/United_States_40_mm_grenades

https://en.wikipedia.org/wiki/M203_grenade_launcher

 

[Old Pueblo]

It looks like it has a primer, so it could be some sort of shell for sure.

 

[SkaBa]

Maybe a Coffman engine starter

Look up pics of Coffman engine starters. They range in size of shot gun shells to larger all metal casings with primers.